Speed-controlling mechanism for planers



Dec. 19, 1922.

SPEED CONTROLLING MECHANISM FOR PLANEPS. FILED MAR.18. 1921.

I IN ENTOR ATTORNEY L zwAi i A. THOSCH.

Patented Dec. l9,-

ALF BED TRO SCH, OF RQCI-EESTER, NEW YORK, ASSIGNOR TO ARTHUR H. INGLIQVOK aocnnsrnn, NEW roan.

SPEED-CONTROLLING MECHANISM FOR. PLANERS- Application filed' March 18, 1921. 7 Serial No. 453,472.

To all w from. it 'HMZQ/ concern:

Be it known that I, ALFRED Tnosori, a citizen of the United States of America, resid ing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Speed- Controlling Mechanism for Planers, of which the followingis a specification.

My invention relates to metal planers, and has for its purpose to aii'ord a practical and simple mechanism for controlling the speed of an electrically driven machine.

More particularly, the invention has to do with the type of planer adapted for operating upon work at different points throughout the forward traveler the work support and driving the work support at a slow rate or speed during cutting operations and at a fast rate of speed between such cutting operations.

A further'purpose of the improvement is to provide a mechanism for electrically driven machines, in such a way that the work support is returned at a constant rate of speed, although making its forward travel at variable speeds as already explained.

The invention also comprehends certain other improvements and advantageous fea tures as will appear from the following detailed description, in conjunction with the accon'ipanyingdrawings, the novel features being pointed out in the claims following the specification.

In the drawings:

Figure 1 is a side elevation of a planer, equipped with a preferred embodimentof the invention.

Figure 2 is a similarview, enlarged and partially broken away. I

Figure Sis an end elevation, and

Figure 4 is a view similar to Figure 3, with the switch ho adjusted to'inoperative position.

In general, the invention mniprises a re 5 ance-controlling switch, governing a re unce element in the circuit of the motor operating the work support oil. the planer, and the switch is alternately moved back and forth during the forward travel of the work support, but remains stationary during the return travel of the work support. This is preferably accomplished by providing the switch with horizontallyextending operating portions located one above the other and terminating in di-fii'erent vertical planes,

while the traveling work support carries devices such as, pairs of adjustable dogs which the worksupport travels along, the shorter dog of a pair engaging theupper gperating portion moves the switch 111 one direction,

while the longer dog of the pair cooperating with the lower. operating portion of the switch returnsthe latter to its normal position. The distance between the dogs of each pair represents the distance through which the work support travels at a slowspeed for cutting, while the distance between one pair and'the first dog of the next. pair represents the distance through which the work support travels at'a fast rate of speed. During the return travel ofthe work support, the con trolling dogs ride over the operating portions of the switch without attesting the position of the same. a The switch box carrying theswitch, is preferably mounted upon the bed of the machine at a, point underi-ieaththe traveling work support and in such manner as to be adjustable horizontally, so as to move the switch out of cooperating relationship with the controlling dogs,when it is desired to drive the work support forwardly at a constant speed.

; Referring nowto the present disclosure which is intended to illustrate oneexample of a practical embodiment of the invention, A designates the bed of the machine while B is theelectrically driven work support or table traveling on-the bed, these parts being oi the usual form wellknow-n in the art of metal planers, and it will be understoodthat the tool, mounted on across head above the i a an"! back and forth to control a resistance element, not shown, for varying the speed of the motor which drives the traveling work support. Vl hen the switch is in the vertical position illustrated in Figure 2 in dotted lines the table travels at a fast rate of speed, and when the switch is inclined to the vertical, as shown in Figures 1 and 3 the table travels at a slow rate of speed, the position or the switch being determined by the controlling devices or dogs on the traveling work support, as now to be described.

The switch is provided at its upper and lower ends with horizontally extending operating portions, or projections e, 6 located in different horizontal planes, and the lower one projecting away from the switch farther than the upper one so that they terminate indifferent vertical planes. Arrangedon the traveling work support are pairs of dogs, as many as may be desired, and each pair comprises a'short downwardly extending dog F, which engages the upper operating portion 6 on the switch, and a longer downwardly extending dog F, which engages the lower operating portion 6 on the switch. The lower end of the long dog F is offset with reference to its upper portion, so as to clear the upper operating portion 6 and engage the lower operating portion e, as shown in figure.

Each dog is pivotally mounted in a carrier Gr, adjustably arranged in a dove-tail slot H at the side of the traveling work support, and the dog, by reason of its pivotal connection is free to swing in one direction, so as to ride over its operating portion of the switch during the return travel of the work support, and is held rigidly against swinging movement in the opposite direction by the carrier G, soas to engage its operating'portum oi the switch and move the latter properly during the forward travel of the work support.

The operation of the mechanism briefly is as follows: The switch box D is adjusted outwardly to proper relationship with the dogs, and the controlling dogs are adjusted on the work support, in accordance with the location of the parts of the work where operations are to be performed. Assuming that the parts are in the position shown in Figure 2"in dotted lines the work support starts to travel forwardly and moves inthis end of such cutting operation, the second dog F of the pair engages the lower operatingportion e of the switch, swinging the latter in the opposite direction and returning it to its normal position. This cuts out the resistance element, and causes the work support to travel at a faster rate of speed until the next pair of dogs is encountered. This operation is repeated as many times as there are pairs of dogs during the forward travel of the work support, and during its return movement, all the control ling dogs swin about their pivotal points, and ride over tie operating portions of the switch, so that the latter is not moved during the return travel of the work support, which is consequently driven at a constant rate of speed until it again starts forwardly. If atany time it is desirable to temporarily eliminate the speed changing mechanism, this is done by loosening the attaching devices for the switch box, and sliding the latter toward the bed A, until the switch operating portions are out of the path of the controlling dogs on the work support.

I claim: I

1. In a planer, the combination with a bed and an electrically driven work support traveling thereon, of an oscillatory resistance-controlling switchfor varying the speed of the work support, said switch having mounted thereon oppositely arranged operating portions located in different horizontal planes, and dogs of different lengths extending downwardly from the work support, the lower ends of said dogs cooperat ing with said operating portions on the switch to move it first in one direction and then in the other.

2. In a planer, the combination with a bed and an electrically driven work support traveling thereon, of an oscillatory resistance-controlling switch for varying the speed of the work support, said switch having mounted thereon oppositely arranged operating portions located in di'lliercnt horizontal planes and tern'linating in different vertical planes, and dogs of: difierent lengths extending downwardly from the work support, the lower ends of the dogs being ar ranged in difierent vertical planes and cooperating with said operating portions on the switch to moveit first in one direction and then in the other.

3. In a planer, the combination with a bed and an electrically driven work support traveling thereon, of an oscillatory resistancecontrolling switch for varying the speed of the work support, said switch having mounted thereon oppositely arranged operating portions located in different horizontal planes and terminating in different vertical planes, dogs of different lengths eX- tending downwardly from the work support, the lower ends of the dogs being arranged in different vertical planes and cooperating; with said operating portions on the switch to move it first in one direction and then in the other, and supporting devices adjustably mounted on the work support, the dogs being pivoted on the supporting devices and retained against movement in one direction, whereby the dogs are free to ride over the operating portions of the switch without movingit during the return travel of the work support.

4. In a planer, the combination with a bed and an electrically driven w rk support traveling thereon, of a resistance-controlling switch for varying the speed of the work support, devices carried by the work support and cooperating with said switch, supports secured to the bed beneath ance controlling switch for varying the speed of the work, said switch. having mounted thereon oppositely arranged operating portions located in different horizontal planes, dogs of different lengths extending downwardly from the work support, the lower ends of said dogs cooperatingwith the operating portions on the switch to move said switch first in one direction and then in the other, and a switch box containing said switch and adjustable on the bed to move the switch operating portions into or out of the path of said dogs.

In witness whereof, I have hereunto signed my name.

ALFRED TROSCH, 

